patch for -Wno-long-long and early GNAT compilers

[Richard Kenner]

    > As mentioned in <http://gcc.gnu.org/ml/gcc/2002-03/msg00327.html>
    > you can boostsrap by using an installed C+Ada compiler built before the 
    > merge.

    Not good enough.  The released 3.1 has to be buildable with the
    previous official release.

There has not *been* a "previous official release" of GNAT by FSF.